Three-time victor Djokovic was also heading for the exit after the second seed quit his quarter-final against Tomas Berdych with a right elbow injury while trailing 7-6 (7/2), 2-0.
Novak Djokovic was in a sad state on Wednesday at the All England Club, when a nagging elbow injury that had been bothering him for a year and a half finally got the best of him. "I said, "just give it a shot, go 100 percent", and it's a great feeling to be winning that match", added Muller whose only other win over the great Spaniard also came at Wimbledon, 12 years ago.
In advance of his match with Berdych, Djokovic said, he spent 2 1/2 hours on the training table. You need a bit of luck, and to feel great. "But I just think it was a wrong decision not to play us last night, because we could have played".
Tomas Berdych held a 7-6 (2), 2-0, 15-love lead when the second-seeded Djokovic walked to net and shook hands retiring after 63 minutes of play on Court No. 1.
Novak Djokovic is considering a break from tennis, with surgery on his injured right elbow now a possibility.
Djokovic is not the only leading player through to the last eight despite injury troubles. Berdych won their 2010 Wimbledon semifinal in straight sets en route to his lone Grand Slam final, but Djokovic clinched their second grass-court meeting 7-6 (5), 6-4, 6-3 in the 2013 quarterfinals.
He hasn't won one since. World number one Murray will face Sam Querrey for a place in the semi-finals. Murray was hampered by a sore hip. Federer's opponent is Milos Raonic the third time in four years they'll face each other at the tournament.
The first man to reach the quarterfinals was Marin Cilic. Last year, he lost to Djokovic in the second round at Wimbledon, also in straight sets. He's been there so many years and has got experience. The grass-court season was hard because of the back issues I had, and the knee issues. I wouldn't rule Murray out though.
"I tried what I could do yesterday getting in the condition that I'm able to play".
"Today was by far the best I hit the ball, the cleanest I hit the ball", Murray said in his post-match press conference. "I'm very pleased with how I'm playing". I'm rested. I'm fresh. Our bodies have taken a lot physically.So, I mean, as an athlete, one way or another, at a certain stage of your career, you're going to experience these kind of things.
An 11th ace brought up a match point and Federer clinched victory when Raonic shunted a backhand wide.
Djokovic, who defeated Adrian Mannarino in the fourth round, said the courts are among the worst he's played on in his 13 years at the All England Club. We spoke with the referee, supervisors, trying to understand the thought process that they are having.